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公开(公告)号：US2581158A
公开(公告)日：1952-01-01
申请号：US9145049
申请日：1949-05-05
Applicant: SERVO CORP OF AMERICA
Inventor： GORDON WILLEY FRANK
IPC: H02P7/292
CPC classification number: H02P7/293 , Y10T307/872
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